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#2432624 - 11/12/11 11:45 AM Mixing synthetic and conventional?
zerosoma Offline


Registered: 08/12/11
Posts: 2280
Loc: Omaha, NE
Thinking since I have a stash of both Quaker State Green Bottle and Quaker State UD that I could make it last a little longer by adding half dino and half synthetic. They are both 5W-30. Would this be okay or am I asking for trouble?

Also, to make things cheaper, since I live in South Dakota with cold winters, I was thinking of running conventional in the summer and synthetic (for its flow properties) in the winter on both our vehicles.

Is this change from dino to synthetic every year bad? I would probably put dino in around april or may and change it to synthetic around october/november.

Just looking for some input. thanks!
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#2432631 - 11/12/11 11:52 AM Re: Mixing synthetic and conventional? [Re: zerosoma]
Loobed Offline


Registered: 07/20/07
Posts: 3742
Loc: Northern California, USA
Yes it is OK. I have been doing that to get rid of some 15w-40 oil I got for 25 cents a quart and some 5w-20 QSUD I got for $1 a quart. I mix it 50/50 and get something like 10w-30.
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#2432634 - 11/12/11 11:59 AM Re: Mixing synthetic and conventional? [Re: zerosoma]
hate2work Offline


Registered: 09/04/08
Posts: 4617
Loc: Western Washington

Don't do it, it will ruin your engine, especially in South Dakota!!!

Just kidding smile

Google is your friend...

https://www.google.com/search?q=mixing+s...amp;safe=images
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#2432637 - 11/12/11 12:04 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
oily boyd Offline


Registered: 05/23/05
Posts: 531
Loc: WI
I do it all the time.

I fill my 09 camry with 4.5 qts of PU, PP or M1 for an interval of 7.5K miles.

I then top up with PYB or Super 5000 - half a quart every 2k miles. Car has 160k on it.
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#2432646 - 11/12/11 12:16 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
daves87rs Offline


Registered: 02/23/09
Posts: 16283
Loc: Michigan
Not going to hurt..and it may even help.

That's the treatment my Cav gets now Convent-summer/syn-winter...no issues at all.
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#2432654 - 11/12/11 12:24 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
kozanoglu Offline


Registered: 09/10/11
Posts: 709
Loc: MKE
What comes out of the mix of 0W50 and 0W-20?
I have some Eneos Sustina 0W50 which is not good for any of my cars on its own and Toyota 0W20.

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#2432760 - 11/12/11 03:11 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
fdcg27 Offline


Registered: 09/25/09
Posts: 13285
Loc: OH
This won't cause any problems.
It's all oil, and the syn you're using is a highly refined mineral oil anyway.
I'd go with your plan and use the QSUD during the winter and the QSGB during the summer.
Don't mix the two, use them where they will perform best.
The QSUD would be a good winter oil, or a summer one, for that matter, while the QSGB will be fine for warmer weather.
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#2432801 - 11/12/11 04:23 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
Papa Bear Offline


Registered: 08/11/05
Posts: 6599
Loc: Leamington, ON, Canada ..... r...
Originally Posted By: zerosoma
Thinking since I have a stash of both Quaker State Green Bottle and Quaker State UD that I could make it last a little longer by adding half dino and half synthetic. They are both 5W-30. Would this be okay or am I asking for trouble?




Per Valvoline.com's webpage:


Can you mix different types of motor oil? For example, synthetic and synthetic blend or regular and synthetic? Is this going to cause problems?

Mixing synthetic and conventional oils will not cause any problems. The oils are compatible with each other.
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#2433630 - 11/13/11 06:04 PM Re: Mixing synthetic and conventional? [Re: Papa Bear]
fdcg27 Offline


Registered: 09/25/09
Posts: 13285
Loc: OH
That's nice, but last that I looked, neither QSUD nor QSGB were Valvoline products.
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12 Accord LX 61K HGMO 0W-20
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#2434175 - 11/14/11 12:54 PM Re: Mixing synthetic and conventional? [Re: kozanoglu]
Loobed Offline


Registered: 07/20/07
Posts: 3742
Loc: Northern California, USA
Originally Posted By: kozanoglu
What comes out of the mix of 0W50 and 0W-20?
I have some Eneos Sustina 0W50 which is not good for any of my cars on its own and Toyota 0W20.


Mix 2 quarts of 0w-50 with 4 quarts of 0w-20 to get something close to 0w-30. There are other factors, but it will be close to a 30 weight.

(50x2)+(20x4)=180 ===> 180/6=30
_________________________
Engine: 2001 GM 5.3L LM7
Current Fill: Valvoline Synpower 5w-30 w/Pure-One PL25288 filter

I.M.N Oil Enthusiast

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#2434183 - 11/14/11 01:14 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
teddyboy Offline


Registered: 01/18/10
Posts: 964
Loc: NC, United States
It's called semi-synthetic although your blend would probably be heavier on the synthetic side which should be a good thing. Hence it would probably be a better blend of syn and dino for the same or less money.
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#2434184 - 11/14/11 01:16 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
lexus114 Offline


Registered: 05/12/08
Posts: 6206
Loc: Easton, PA
its okay and all to do so, I just dont know why you want to bother. IMO just do one or the other.
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#2435287 - 11/15/11 02:15 PM Re: Mixing synthetic and conventional? [Re: lexus114]
zerosoma Offline


Registered: 08/12/11
Posts: 2280
Loc: Omaha, NE
Originally Posted By: lexus114
I just dont know why you want to bother.


Conventional is cheaper, I have a stock of synthetic and I'd like to make it last longer.


Edited by zerosoma (11/15/11 02:16 PM)
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#2439290 - 11/19/11 05:35 PM Re: Mixing synthetic and conventional? [Re: zerosoma]
otis24 Offline


Registered: 10/30/05
Posts: 1487
Loc: South Dakota
I work at a Ford dealership. I can buy my oil at cost +10%. Needless to say, I can buy MC sytnthetic blend very cheaply and I can use the shop's lift, tools and dispose of my oil there. I run 3 qts MC syn blend and 2 qts MC full synthetic. If I did my math correctly, I'm getting a 64% synthetic.


Edited by otis24 (11/19/11 05:37 PM)
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